interfac.c

用Ｃ语言编的邮件系统（毕业论文）

#include	"mail.h"

struct message *msgp; 
MAIL *openfile(char *file)
{
 MAIL *mail;
 if( (mail=mail_open(file, O_RDWR ,FILE_MODE))==NULL)
     err_sys("mail_open error");
return mail;
}
MAIL *newfile(char *file)
{
 MAIL *mail;
 if ( (mail = mail_open(file, O_RDWR | O_CREAT | O_TRUNC,
				FILE_MODE)) == NULL)
		err_sys("mail_new error");

return mail;
}
int getmsgfrmdb(char *user)
{
  FILE *fp;
  MAIL *mail;
  char key[1024],*ptr,ch; 
  int i,j,keylen;  

  mail=openfile(user);
  
  if((fp=fopen(TMPMSGFILE,"w+"))==NULL)
     err_sys("open MSGFILE error");

   i=0;
   msgph=(struct message*)calloc(100,sizeof(struct message));
    msgp=msgph;
       
   mail_rewind(mail);
   do
    { 
      ptr=mail_nextrec(mail,key);
      if(ptr!=NULL) 
      {
        for(j=0,msgp=msgph;j<i;j++,msgp++);
        msgp->messageid=(char*)malloc(strlen(key));
        msgp->content=(char*)malloc(strlen(ptr));
        strcpy(msgp->messageid,key);
        strcpy(msgp->content,ptr); 
     
        if(i==0)
        { 
           fprintf (fp,"You have mail.\n");
           fprintf (fp,"\n");
         }   
        fprintf(fp,"%d\t%s\n",i+1,hint);

        i++; 
      }
    }while(ptr!=NULL);

  if(i==0)
   fprintf(fp,"No mail for you!");
                                         
  fclose(fp);    
  mail_close(mail);
  return 0;  
}

void showmsghdr(int fd,int sd)
{
 char buf[MAXLINE];
 int len;
  while((len=ReadLine(fd,buf,MAXLINE))>0)
     write(sd,buf,len);
 close(fd); 
}
/*msgp can be set up when the client come into the system
and be free when the client leave the system*/
/*char *GetMail(int msgno)
{
  return(msgp[msgno]->content);
        
}
*/
int StoreMail(struct message *msg)
{
  MAIL *mail;  
  struct stat statbuf;
  char *name;
  int len;
  
  /*msg.to=ms->to;
  msg.from=ms->from;
  msg.subject=ms->subject;
  msg.content=ms->content;
  */
  len=strlen(msg->to);
  name=(char *)malloc(len+4+1);
  strcpy(name,msg->to);
  strcat(name,".idx");
  if(stat(name,&statbuf)<0) 
     mail=newfile(msg->to);
    else 
     mail=openfile(msg->to);

  if (mail_store(mail, msg) != 0)
     err_quit("mail_store error for");

  mail_close(mail);
  free(name);
  return 0;
}
int DelMail(int msgno,char *user)
{
 MAIL *mail;
  int i;
  msgp=msgph;
  for(i=1;i<msgno;i++)msgp++;
  mail=openfile(user);
  mail_delete(mail,msgp->messageid);
  mail_close(mail);
}
int GetMail(int msgno,char *buf)
{
 int i;
 msgp=msgph;
 for(i=1;i<msgno;i++)msgp++;
 /*printf("in getmail content=%s",msgp->content);*/
 strcpy(buf,msgp->content);
}
int client_close(int sd)
{
 free(msgp);
 return close(sd);
}